Retractable door leaf

Abstract

To provide an easy-to-use telescoping gate.SOLUTION: A telescoping gate, which includes a door end side door 1 and a hanging side door 2, is configured such that the door end side door 1 and the hanging side door 2 can be folded in parallel with each other by: making the door end side door 1 and the hanging side door 2 extendable in the right and left directions, respectively; connecting the door end side door 1 and the hanging side door 2 in a foldable manner with a hinge 3 such that their road side faces are close to each other; connecting the hanging side door 2 with a hinge 4 to a gate post 5b rotatably on the site side; forming a door end stile and rail 6 to the door end side door 1; providing a handle 7 on the face of the door end stile and rail 6; and storing a protrusion B of the handle 7 from the door end side door 1 in a gap S between the door end side door 1 and the hanging side door 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a telescopic door leaf.

Background Art

[0002] As a door leaf installed at the boundary between a road and a site, a telescopic door leaf that expands and contracts in the left - right direction to open and close has been conventionally known. In such a telescopic door leaf, a more user - friendly one is required.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In view of the above - described situation, the purpose of the present invention is to provide a user - friendly telescopic door leaf.

Means for Solving the Problems

[0004] The telescopic door leaf according to the invention described in claim 1 for achieving the above - mentioned problems includes a leading - end side door leaf and a hanging - end side door leaf. The leading - end side door leaf and the hanging - end side door leaf are each telescopically expandable and contractible in the left - right direction. The leading - end side door leaf and the hanging - end side door leaf are pivotally connected by a hinge so as to be foldable such that the surfaces on the road side are close to each other. The hanging - end side door leaf is pivotally connected to a door post by a hinge so as to be rotatable toward the site side. The leading - end side door leaf has a leading - end frame, and a handle is provided on the finding surface of the leading - end frame. The protrusion of the handle from the leading - end side door leaf is accommodated in the gap between the leading - end side door leaf and the hanging - end side door leaf, so that the leading - end side door leaf and the hanging - end side door leaf can be folded in parallel.

[0005] The telescopic door leaf according to the invention described in claim 2 includes a leading - end side door leaf and a hanging - end side door leaf. The leading - end side door leaf and the hanging - end side door leaf are each telescopically expandable and contractible in the left - right direction. The leading - end side door leaf and the hanging - end side door leaf are pivotally connected by a hinge so as to be foldable such that the surfaces on the road side are close to each other. The hanging - end side door leaf is pivotally connected to a door post by a hinge so as to be rotatable toward the site side. The leading - end side door leaf has a leading - end frame, and a handle is provided on the finding surface of the leading - end frame. The hanging - end side door leaf has a hanging - end side latch at the hanging - end side end. The handle and the hanging - end side latch are provided with a vertical offset, so that the leading - end side door leaf and the hanging - end side door leaf can be folded in parallel.

[0006] The retractable door according to the invention described in claim 3 includes a door tip side door and a suspension side door. The door tip side door and the suspension side door are each retractable in the left-right direction. The door tip side door and the suspension side door are pivotally connected by a hinge so as to be foldable with the surfaces on the road side approaching each other. The suspension side door is pivotally connected to a door post by a hinge so as to be rotatable toward the site side. The door tip side of the door tip side door has a single caster, and the door butt side of the door tip side door or the door tip side of the suspension side door has a single caster. By this, the door tip side door and the suspension side door can be folded in parallel. Below the door tip side door position has a single caster, and the door butt side of the door tip side door Below the position of the door tip side door or the door tip side of the suspension side door Below the suspension side door position has a single caster so that single casters do not interfere with each other, a single caster, the door tip side door, and the suspension side door characterized in that the door tip side door and the suspension side door can be folded in parallel.

[0007] The retractable door according to the invention described in claim 4 includes a door tip side door and a suspension side door. The door tip side door and the suspension side door are each retractable in the left-right direction. The door tip side door and the suspension side door are pivotally connected by a hinge so as to be foldable with the surfaces on the road side approaching each other. The suspension side door is pivotally connected to a door post by a hinge so as to be rotatable toward the site side. The door tip side of the door tip side door has a caster mounted within the expected dimension of the door tip side door, and the door butt side of the door tip side door or the door tip side of the suspension side door has a caster mounted within the expected dimension of the door tip side door or the suspension side door. By this, the door tip side door and the suspension side door can be folded in parallel.

Effect of the Invention

[0008] The retractable door according to the invention described in claim 1 includes a door tip side door and a suspension side door. The door tip side door and the suspension side door are each retractable in the left-right direction. The door tip side door and the suspension side door are pivotally connected by a hinge so as to be foldable with the surfaces on the road side approaching each other. The suspension side door is pivotally connected to a door post by a hinge so as to be rotatable toward the site side. The door tip side door has a door tip frame, and a handle is provided on the finding surface of the door tip frame. The protrusion of the handle from the door tip side door is accommodated in the gap between the door tip side door and the suspension side door. By this, the door tip side door and the suspension side door can be folded in parallel. Therefore, when the retractable door is folded and rotated 90 degrees for storage toward the site side, the protrusion toward the site side can be reduced, and the effective opening width can be increased, so that it is easy to use.

[0009] The retractable door according to the invention described in claim 2 includes a door tip side door and a hanging end side door. The door tip side door and the hanging end side door are each retractable in the left-right direction. The door tip side door and the hanging end side door are pivotally connected by a hinge so that they can be folded with the surfaces on the road side approaching each other. The hanging end side door is pivotally connected to a door post on the site side by a hinge so that it can rotate. The door tip side door has a door tip frame, and a handle is provided on the finding surface of the door tip frame. The hanging end side door has a hanging end side latch at the hanging end side end. The handle and the hanging end side latch are provided with a vertical offset, so that the door tip side door and the hanging end side door can be folded in parallel. Therefore, when the retractable door is folded and rotated 90 degrees to be stored on the site side, the protrusion to the site side can be reduced, and the effective opening width can be increased, so it is easy to use.

[0010] The retractable door according to the invention described in claim 3 includes a door tip side door and a hanging end side door. The door tip side door and the hanging end side door are each retractable in the left-right direction. The door tip side door and the hanging end side door are pivotally connected by a hinge so that they can be folded with the surfaces on the road side approaching each other. The hanging end side door is pivotally connected to a door post on the site side by a hinge so that it can rotate. The door tip side Below the door tip side door position has a single caster, and the door butt side Below the position of the door tip side door or the door tip side of the hanging end side door Below the suspension side door has a single caster so that single casters do not interfere with each other, a single caster, the door tip side door, and the suspension side door at the position. Therefore, the door tip side door and the hanging end side door can be folded in parallel. Thus, when the retractable door is folded and rotated 90 degrees to be stored on the site side, the protrusion to the site side can be reduced, and the effective opening width can be increased, so it is easy to use.

[0011] The retractable door according to the invention described in claim 4 includes a door tip side door and a suspension side door. The door tip side door and the suspension side door are each retractable in the left-right direction, and the door tip side door and the suspension side door are hingedly connected so as to be foldable such that the surfaces on the road side are close to each other. The suspension side door is hingedly connected to a door post so as to be rotatable toward the site side. The door tip side door has casters mounted within the expected dimensions of the door tip side door at the position on the door tip side of the door tip side door, and has casters mounted within the expected dimensions of the door tip side door or the suspension side door at the position on the door butt side of the door tip side door or the door tip side of the suspension side door. Thus, the door tip side door and the suspension side door can be folded in parallel, so that when the retractable door is folded and rotated 90 degrees toward the site side for storage, the protrusion toward the site side can be reduced and the effective opening width can be increased, resulting in good usability.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 6 show an embodiment of a telescopic door leaf according to the present invention. As shown in FIG. 4, this telescopic door leaf is installed between a pair of gateposts 5a and 5b erected at the boundary between a road and a residential site, and includes a door tip side door leaf 1 and a suspension side door leaf 2 that are each telescopically extendable in the left-right direction. The door tip side door leaf 1 and the suspension side door leaf 2 are connected by a hinge 3 on the road side. After the telescopic door leaf is retracted to open the door leaf, as shown in FIGS. 1 and 6, the door tip side door leaf 1 and the suspension side door leaf 2 can be folded so that the surfaces on the road side are close to each other. Further, in this telescopic door leaf, the suspension side door leaf 2 is rotatably connected to the suspension side gatepost 5b by a hinge 4 on the site side, so that, as shown in FIGS. 1, 2, and 6, the folded telescopic door leaf can be rotationally stored on the site side.

[0014] As shown in FIGS. 4 and 5, the door tip side door leaf 1 is configured by connecting a door tip frame 6 and a plurality of lattice bodies 10, 10,... in the left-right direction with a pantograph mechanism 11 that is telescopically extendable. The suspension side door leaf 2 is configured by connecting a plurality of lattice bodies 10, 10,... in the left-right direction with a pantograph mechanism 11 that is telescopically extendable. The expected dimension A of the door tip side door leaf 1 and the suspension side door leaf 2 is 77 mm, which is smaller than that of a conventional general telescopic door leaf. Further, in this telescopic door leaf, as will be described later, the casters 9a and 9b do not protrude to the road side or the site side, and can be stored on the site side in a compact form, so it is suitable for houses in urban areas where it is difficult to secure a large site.

[0015] As shown in FIG. 5, the lattice body 10 on the door butt side of the door tip side door leaf 1 and the lattice body 10 on the door tip side of the suspension side door leaf 2 are connected by a hinge 3 on the road side. As a result, as shown in FIG. 1, this telescopic door leaf can be folded so that the door tip side door leaf 1 and the suspension side door leaf 2 are close to each other on the road side. When folded, a gap S corresponding to the diameter of the cylindrical portion of the hinge 3 is formed between the door tip side door leaf 1 and the suspension side door leaf 2.

[0016] As shown in Fig. 5, the leading-edge frame 6 has a convex cross-sectional shape where the expected dimension on the leading-edge side is smaller than that on the suspension side. A handle 7 is attached to the finding surfaces on the road side and the site side of the leading-edge side where the expected dimension has become smaller. As shown in Figs. 3 and 4, the handle 7 has a substantially square bar shape that is long in the vertical direction and minimizes the protrusion from the mounting surface. The fingers are hooked on the hole-shaped handgrip portion 12 formed below the intermediate position in the vertical direction for operation. The leading-edge frame 6 is provided with a leading-edge side latch 14 that engages with a receiver 13 provided on the leading-edge side door post 5a when the door leaf is closed (see Fig. 5). An operation lever 15 for releasing the leading-edge side latch 14 is provided on the side surface of the suspension side of the handle 7.

[0017] In this way, for this retractable door leaf, the expected dimension on the leading-edge side of the leading-edge frame 6 is reduced, and the handle 7 is attached to the finding surface on the leading-edge side where the expected dimension is reduced. Also, the protruding dimension of the handle 7 itself is minimized as much as possible. As a result, as shown in Fig. 1, the protrusion B of the handle 7 from the leading-edge side door leaf 1 fits into the gap S between the leading-edge side door leaf 1 and the suspension side door leaf 2, and the leading-edge side door leaf 1 and the suspension side door leaf 2 can be folded parallel to each other. Note that, as shown in Fig. 8, the handle 90 of a conventional retractable door leaf is generally formed in an L-shaped bend in plan view, and it is common to grasp and operate the vertical piece portion of the handle 90 by hand. In that case, the handle 90 would collide with the suspension side door leaf 2, and the leading-edge side door leaf 1 and the suspension side door leaf 2 could not be folded parallel to each other.

[0018] As shown in Figs. 3 and 4, a caster (single caster) 9a is attached to the lower end portion of the leading-edge frame 6 of the leading-edge side door leaf 1 at the central position in the expected direction. The caster 9a is a freely rotatable caster around the mounting shaft 16. Similarly, a caster (single caster) 9a is also attached to the lower end portion of the lattice body 10 on the most leading-edge side of the suspension side door leaf 2.

[0019] In this way, for this expandable and retractable door leaf, the casters 9a provided at the leading end side of the leading end side door leaf 1 and the leading end side of the suspension end side door leaf 2 are single casters 9a attached to the central position in the expected direction of each door leaf 1, 2. As shown in Fig. 1, when the leading end side door leaf 1 and the suspension end side door leaf 2 are folded, the casters 9a do not interfere with the door leaves 1, 2, so the leading end side door leaf 1 and the suspension end side door leaf 2 can be folded in parallel. Note that, as shown in Fig. 8, the caster 91 of the conventional expandable and retractable door leaf is a double caster taken out and attached to the road side and the site side with a metal fitting 92. In that case, the mounting metal fitting 92 and the mounting shaft 93 of the caster 91 hit the door leaves 1, 2 and the leading end side door leaf 1 and the suspension end side door leaf 2 cannot be folded in parallel.

[0020] Instead of attaching the caster 9a to the lattice body 10 on the leading end side of the suspension end side door leaf 2, the caster 9a can also be attached to the lattice body 10 on the trailing end side of the leading end side door leaf 1.

[0021] As shown in Figs. 1 to 3, the suspension end side door leaf 2 is connected to the suspension end side door post 5b on the site side by a hinge 4. Thereby, the folded expandable and retractable door leaf can be rotated to the site side for storage. On the side opposite to the hinge 4 (road side) of the suspension end side door leaf 2, a suspension end side latch 8 is provided. As shown in Fig. 3, the suspension end side latch 8 has a pin 18 that can be moved up and down with a knob 17. When the door leaf is closed, by inserting this pin 18 into the cylindrical portion of the metal fitting 19 provided on the road side of the suspension end side door post 5b, the lattice body 10 on the suspension end side can be fixed so as not to rotate with respect to the suspension end side door post 5b. By pulling up the pin 18 with the knob 17 and pulling it out from the cylindrical portion of the metal fitting 19, the folded expandable and retractable door leaf can be rotated and stored on the site side. As shown in Fig. 3, the suspension end side latch 8 is provided with a shift in the vertical direction from the handle 7 attached to the leading end frame 6 of the leading end side door leaf 1. Therefore, when the leading end side door leaf 1 and the suspension end side door leaf 2 are folded, the handle 7 and the suspension end side latch 8 do not interfere with each other, so as shown in Figs. 1 and 2, the leading end side door leaf 1 and the suspension end side door leaf 2 can be folded in parallel.

[0022] Figure 6 shows the usage state of the retractable door leaf of the present invention. As shown in Fig. 6(a), the retractable door leaf is extended and the latch 14 provided on the door end frame 6 is engaged with the receiver 13 of the door end side door post 5a to close the door leaf. When opening the door leaf, press down the operation lever 15 to release the door end side latch 14, and hook a finger on the handle part 12 of the handle 7 and move the door end frame 6 to the suspension side. Then, as shown in Fig. 6(b), the door end side door leaf 1 and the suspension side door leaf 2 are retracted. After that, when the suspension side latch 8 is released, as shown in Fig. 6(c), the suspension side door leaf 2 can be rotated to the site side while folding the door end side door leaf 1 and the suspension side door leaf 2. Fig. 6(d) shows a state in which the folded retractable door leaf is rotated 90 degrees to the site side and stored. By folding the retractable door leaf in this way, the protrusion L to the site side can be reduced, and moreover, since the door end side door leaf 1 and the suspension side door leaf 2 can be folded in parallel, the effective opening width W can be increased. As a result, the site on the house side can be effectively used, and when a vehicle or the like enters and exits, the retractable door leaf is less likely to get in the way, which is convenient to use. Furthermore, as shown in Fig. 6(e), the present retractable door leaf can also be rotated 180 degrees to the site side and stored, and by doing so, the effective opening width W can be further increased.

[0023] Fig. 7 shows another embodiment of the retractable door leaf of the present invention. In this retractable door leaf, double casters 9b, 9b are attached to two positions, namely the road side position and the site side position, on the lower surface of the door end frame 6 of the door end side door leaf 1. On the suspension side door leaf 2, double casters 9b, 9b are attached to two positions, namely the road side position and the site side position, on the lower surface of the lattice body 10 at the outermost door end side. By using double casters for the casters 9b, 9b in this way, the retractable door leaf stands more stably and independently. Moreover, since the casters 9b, 9b are attached within the expected dimensions of the door end side door leaf 1 and the suspension side door leaf 2, the casters 9b, 9b do not get in the way when folding the door end side door leaf 1 and the suspension side door leaf 2, and the door end side door leaf 1 and the suspension side door leaf 2 can be folded in parallel in the same way as in the case of the single caster 9a.

[0024] As described above, this telescopic door leaf includes a door tip side door leaf 1 and a suspension side door leaf 2. The door tip side door leaf 1 and the suspension side door leaf 2 are each telescopically extendable in the left-right direction. The door tip side door leaf 1 and the suspension side door leaf 2 are connected by a hinge 3 so as to be foldable such that the surfaces on the road side are close to each other. The suspension side door leaf 2 is rotatably connected to a door post 5b on the site side by a hinge 4. The door tip side door leaf 1 has a door tip frame 6, and a handle 7 is provided on the finding surface of the door tip frame 6. Since the protrusion B of the handle 7 from the door tip side door leaf 1 is accommodated in the gap S between the door tip side door leaf 1 and the suspension side door leaf 2, the door tip side door leaf 1 and the suspension side door leaf 2 can be folded in parallel. Thus, when the telescopic door leaf is folded and rotated 90 degrees for storage on the site side, the protrusion L on the site side can be reduced and the effective opening width W can be increased, making it convenient to use. The door tip frame 6 has a smaller expected dimension on the door tip side than on the suspension side. By providing the handle 7 on the finding surface of the door tip side with a smaller expected dimension, it can be made large enough to hang a finger for operation while being accommodated in the gap S between the door tip side door leaf 1 and the suspension side door leaf 2 after folding the handle 7. Since an operation part (operation lever) 15 for performing the release operation of the door tip side latch 14 is provided on the side surface on the suspension side of the handle 7, the operation part 15 does not get in the way when folding the door tip side door leaf 1 and the suspension side door leaf 2 in parallel.

[0025] Also, this telescopic door leaf includes a door tip side door leaf 1 and a suspension side door leaf 2. The door tip side door leaf 1 and the suspension side door leaf 2 are each telescopically extendable in the left-right direction. The door tip side door leaf 1 and the suspension side door leaf 2 are connected by a hinge 3 so as to be foldable such that the surfaces on the road side are close to each other. The suspension side door leaf 2 is rotatably connected to a door post 5b on the site side by a hinge 4. The door tip side door leaf 1 has a door tip frame 6, and a handle 7 is provided on the finding surface of the door tip frame 6. The suspension side door leaf 2 has a suspension side latch 8 at the suspension side end. Since the handle 7 and the suspension side latch 8 are provided with a vertical offset, the door tip side door leaf 1 and the suspension side door leaf 2 can be folded in parallel. Thus, when the telescopic door leaf is folded and rotated 90 degrees for storage on the site side, the protrusion L on the site side can be reduced and the effective opening width W can be increased, making it convenient to use.

[0026] In addition, this expandable and retractable door comprises a door tip side door 1 and a hanging end side door 2. The door tip side door 1 and the hanging end side door 2 are each expandable and retractable in the left - right direction. The door tip side door 1 and the hanging end side door 2 are connected by a hinge 3 so as to be foldable with the surfaces on the road side approaching each other. The hanging end side door 2 is rotatably connected to a door post 5b on the site side by a hinge 4. The door tip side door 1 has single casters 9a at the door tip side position of the door tip side door 1, and has single casters 9a at the door butt side of the door tip side door 1 or at the door tip side position of the hanging end side door 2. By doing so, the door tip side door 1 and the hanging end side door 2 can be folded in parallel. Therefore, when the expandable and retractable door is folded and rotated 90 degrees for storage on the site side, the protrusion L to the site side can be reduced and the effective opening width W can be increased, so it is user - friendly.

[0027] In addition, this expandable and retractable door comprises a door tip side door 1 and a hanging end side door 2. The door tip side door 1 and the hanging end side door 2 are each expandable and retractable in the left - right direction. The door tip side door 1 and the hanging end side door 2 are connected by a hinge 3 so as to be foldable with the surfaces on the road side approaching each other. The hanging end side door 2 is rotatably connected to a door post 5b on the site side by a hinge 4. The door tip side door 1 has casters 9a, 9b, 9b mounted within the expected dimension A of the door tip side door 1 at the door tip side position of the door tip side door 1, and has casters 9a, 9b, 9b mounted within the expected dimension A of the door tip side door 1 or the hanging end side door 2 at the door butt side of the door tip side door 1 or at the door tip side position of the hanging end side door 2. By doing so, the door tip side door 1 and the hanging end side door 2 can be folded in parallel. Therefore, when the expandable and retractable door is folded and rotated 90 degrees for storage on the site side, the protrusion L to the site side can be reduced and the effective opening width W can be increased, so it is user - friendly. When the casters 9b, 9b are double casters provided at two positions, namely, the position on the road side and the position on the site side within the expected dimension A of the door tip side door 1 and the hanging end side door 2 (see Fig. 7), the expandable and retractable door stands more stably on its own.

[0028] The present invention is not limited to the embodiments described above. The specific structure, size, material, etc. of the door tip side door and the hanging end side door can be changed as appropriate. The handle only needs to have a size such that the protruding part from the expected dimension of the door tip side door fits into the gap formed when the door tip side door and the hanging end side door are folded in parallel. For example, when the folding width (lateral width when contracted) of the door tip side door is larger than that of the hanging end side door, the handle may be located outside the gap between the door tip side door and the hanging end side door. The casters only need to be installed within the expected dimensions of the door tip side door and the hanging end side door, and may protrude slightly from the expected dimensions of the door tip side door and the hanging end side door when turning, etc.

Explanation of Reference Numerals

[0029] 1 Door tip side door 2 Hanging end side door 3 Hinge 4 Hinge 5a Door tip side doorpost (doorpost) 5b Hanging end side doorpost (doorpost) 6 Door tip frame 7 Handle 8 Hanging end side latch 9a Single caster (caster) 9b Double caster (caster)

Claims

1. An expandable and retractable door leaf comprising a door tip side door leaf and a suspension end side door leaf, wherein the door tip side door leaf and the suspension end side door leaf are each expandable and retractable in the left - right direction, the door tip side door leaf and the suspension end side door leaf are connected by a hinge so as to be foldable such that the surfaces on the road side are close to each other, the suspension end side door leaf is rotatably connected to a door post by a hinge on the site side, the door tip side door leaf has a door tip frame, a handle is provided on the finding surface of the door tip frame, and the protrusion of the handle from the door tip side door leaf is accommodated in the gap between the door tip side door leaf and the suspension end side door leaf, so that the door tip side door leaf and the suspension end side door leaf can be folded in parallel.

2. An expandable and retractable door leaf comprising a door tip side door leaf and a suspension end side door leaf, wherein the door tip side door leaf and the suspension end side door leaf are each expandable and retractable in the left - right direction, the door tip side door leaf and the suspension end side door leaf are connected by a hinge so as to be foldable such that the surfaces on the road side are close to each other, the suspension end side door leaf is rotatably connected to a door post by a hinge on the site side, the door tip side door leaf has a door tip frame, a handle is provided on the finding surface of the door tip frame, the suspension end side door leaf has a suspension end side latch at the suspension end side end, and the handle and the suspension end side latch are provided with a vertical offset, so that the door tip side door leaf and the suspension end side door leaf can be folded in parallel.

3. An expandable and retractable door leaf comprising a door tip side door leaf and a suspension end side door leaf, wherein the door tip side door leaf and the suspension end side door leaf are each expandable and retractable in the left - right direction, the door tip side door leaf and the suspension end side door leaf are connected by a hinge so as to be foldable such that the surfaces on the road side are close to each other, the suspension end side door leaf is rotatably connected to a door post by a hinge on the site side, the door tip side door leaf has a single caster at the lower position of the door tip side door leaf on the door tip side of the door tip side door leaf, and has a single caster at the lower position of the door tip side door leaf on the door end side of the door tip side door leaf or at the lower position of the suspension end side door leaf on the door tip side of the suspension end side door leaf, and the single casters do not interfere with each other, or with the door tip side door leaf and the suspension end side door leaf, so that the door tip side door leaf and the suspension end side door leaf can be folded in parallel.

4. It is provided with a door end side door and a suspension end side door. The door end side door and the suspension end side door are each telescopically extendable in the left-right direction. The door end side door and the suspension end side door are pivotally connected by a hinge so as to be foldable such that the surfaces on the road side are close to each other. The suspension end side door is pivotally connected to a door post by a hinge so as to be rotatable toward the site side. It has casters mounted within the expected dimensions of the door end side door at the door end side position of the door end side door, and has casters mounted within the expected dimensions of the door end side door or the suspension end side door at the door butt side of the door end side door or the door end side position of the suspension end side door, thereby enabling the door end side door and the suspension end side door to be folded in parallel. A telescopic door leaf characterized by the above is provided.

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